Piston



(No Model'.)

G. P. FENNER.

PISTON.

Patented Dec. 5, 1882.

r O n. m d f WITNESSES ATTORNEYS N. vzrzns. Pnowum m hkr, Washington. 0 c.

UNITED STATES PATENT OFFICE.

GEORGE P. FENNER, OF NEW LONDON, CONNECTICUT.

PISTON.

SPECIFICATION formingpart of Letters Patent No. 268,654, dated December 5,. 1882.

Application filed August 21, 1882. (No model.)

To all whom it may concern:

Be it known that I, GEORGE P. FENNER, a citizen of the United States, residing at New London, in the county ot'New London and State of Connecticut, have invented new and useful Improvements in Pistons, of which the following is a specification. i

This invention relates to an improvementin pistons for air or liquid pumps and other purposes; and it consists in the means hereinafter described for adjusting a piston to its cyl' inder.

This invention is illustrated in the accompanying drawings, in which Figure l represents a central cross-section. Fig. 2 is a side view. Fig. 3 is a like View, partly in section.

Similar letters indicate corresponding parts.

The letterA designates the head of a piston, cast or otherwise provided with a hub, B, which is threaded externally, and on which is fitted an internally-threaded ring, 0, provision being made for attaching the whole to a pistonrod as by a threaded hole, D, going through the head and its hub. The hub B projects from one side of the piston'head, where the latter carries also a ring, E, at or near the edge,

such ring being attached or held in place by.

screws F or other suitable means; and between this ring and the head is interposed and flange, O, which projects in the direction of and near to the piston-head, while between these flanges and the ring E are interposed springs N, of spiral form-one to each segmentwhich act on the segments with a tendency to retract or draw them inward.

Projecting in an opposite direction to the flange 0, on the inner edge of the segments, is a tapering oli'set, P, and the screw-ring C is tapered in a suitable manner to engage such offset, so that when this ring is screwed inward toward the segments it acts on the latter to force them outward, while when the ring is screwed in an outward direction it releases the fore described, with the piston-head A and its exterually-threaded hub B, of the tapering screw-ring C, the attached ring E, the flanged packing-ring H, the radially-adjustable segments I, each having a flange, O, and tapering ofiset P, and the segment-retracting springs N.

In testimony whereof I have hereunto set myhand and seal in the presence of two subscribing Witnesses, I

GEORGE P. FENNER. [L. s.] Witnesses:

W. HAUFF,

E. F. KAS'IENHUBER. 

